My SD is a Sandisk Ultra 16GB, don’t know why 12GB shows.
I will buy a new SD, and burn a new image and try again.
I’ll keep you in touch.
Thank you to all of you for your help.
Regards.
Maurice
Beware of large SD Cards. There have been reports of cards larger than 32GB not working well. It is not clear if these were bad cards or the size is relevant. 8GB-32GB are fine.
Hi Brian,
I order Sandisk extrem 32GB. Hope it will resolve my problems.
Best regards.
Maurice
Hello Jefomodo,
Thank you very much for your email.
I order some Sandisk Extrem 32GB, and hope it will resolve the problems.
Yes the Hifiberry DAC + ADC is official one.
I don’t know how to use the branch. My level is very limited.
I know to burn an img, but I know nothing in programming.
I know well analog electronic ( it was my studies 35 years ago), I know basic Arduino, but very limited in programming language.
Sometime it seems like magic for me. 
By the way I ordered a full Zynthian 4.6 without Raspberry Pi.
Any idea of the shiping delay? Order No SO9343
Thank you very much for your help and to made this wonderful Synthe.
Best regards.
Maurice
Hello to all helper from Zynthian,
Thank you very much, everything works like a charm now.
The problem was this SD card.
Replace by a Sandisk extrem 32GB and burn img on it with Etcher.
3 hours continue working, no disconnections, Hurra…
Thank you very much…
Best regards to all of you.
Maurice
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How very bizarre. Great that it works now though.